Abstract
This study determines the effects of stearic acid and gamma irradiation, alone and in combination, on properties of amylose-lipid nanomaterials from pasted high amylose maize starch (HAMS) with and without alpha amylase hydrolysis. HAMS was incorporated with stearic acid (0, 1.5% and 5%, w/w), irradiated at 0, 30 and 60 kGy and pasted under pressure in a rheometer. Isolated materials after thermostable alpha amylase or hot water washing were freeze-dried and characterised using differential scanning calorimetry (DSC), X-ray diffraction (XRD), Atomic Force Microscopy (AFM) and Transmission Electron Microscopy (TEM). The isolated materials contain amylose-lipid complexes (ALCs) as determined by DSC and XRD. Pasting of gamma irradiated HAMS produced type I ALCs, whereas that for un-irradiated HAMS produced type II ALCs. The ALCs occurred at nanoscale with sizes ranging from 10 to 110 nm as observed with AFM and TEM. Tailor-made ALCs nanomaterials can be produced from HAMS (with and without added stearic acid).
Original language | English |
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Pages (from-to) | 352-360 |
Number of pages | 9 |
Journal | Carbohydrate Polymers |
Volume | 212 |
DOIs | |
Publication status | Published - 15 May 2019 |
Externally published | Yes |
Keywords
- AFM (Atomic force microscopy)
- Amylose-lipid nanomaterials
- DSC (differential scanning calorimetry)
- SEM (Scanning electron microscopy)
- Starch (PubChem CID: 24836924)
- Stearic acid (PubChem CID: 5281)
- TEM (Transmission electron microscopy)
- WAXS (Wide angle x-ray scattering)
ASJC Scopus subject areas
- Organic Chemistry
- Polymers and Plastics
- Materials Chemistry